Oven-thermometer.



H. BL KERLlN.-

0VEN THERMOMETER. APPLICATION FILED NOV. 4i I918- Patented Mar. 1919.-

e r %m.m L m .6 m m mailman-mum- HGRAGE B. KERLEN, 03? HAMILTON, OI-IZG.

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Sipecification of Letters Patent.

Patented Marl 25, 1919.

Application filed November 4, 15-18. Serial 1% 0. 2603559.

. To all whom it may concern:

Be it known that I, HonAon B. KERLIN, a citizen of the United ed certainnew and useful Improvements in Oven-Thermometers, of which-the followingis a specification. I

This invention pertains to improvements in that class of thermometersadapted for attachment to the door of an oven, and the invention will bereadily understood from the followin description taken in connectionwith t e accompanying drawing in which Figure l is a face elevation ofan oven thermometer exemplifying my invention:

Fig. 2 a horizontal section of the same, in the plane of line a of Figs.1 and 3:

Fig. 3 a vertical section in the plane of line b of Figs. 1 and 2: and xFig. 4 a plan of the thermometer, illustrating a modified form ofeasing.

In the drawing, referring to F 1, and 3 1, indicates the general casingof the instrument:

2, a vertical angular recess in the front thereof:

3,'a scale-plate removably secured to the back of recess Eat a distancefrom the front of the recess:

4:, a thermometer-tube secur d against the front face of thescale-plate:

5, an upwardly'bent portion of the thermometer-tube at the rear of thescale-plate, the upper termination of this upwardly bent P01131011containing the bulb of the tube:

6, graduations upon the face of the scaleplate: 40

7, a chamber in the casing to the rear of scale-plate 3, the scale-plateseparating the two chambers 2 and 7 8, cars projecting from the casingto receive screwstc attach the casing to a plate forming part of theoven-door; and

9, the oven-door, tothe exterior of which the casing .1 is attached."The scaie-plate separates the easing into separate compartments 2 and7, the former of which contains the thermometer tube 4,

- the latter chamber containing the bulbed upturned portion 5 of thetube, the-back wall of the chamber 7 being formed by the ovenidoor towhich the casing is attached. The

compartment? being; separated from the oven by theoven-door 9, thenormal reading States, residing at Hamilton, Butler county, Ohio, haveinventof the graduation 6 would indicate a temperature within the oven,say at a point-midway of the'depth of the oven. These graduations on thescale pIate. may be'properly calibrated by comparison with a therznometer having its bulb disposed at the center of the oven, the scale-platethus indicating actual oven temperature.

The arrangement dispenses with the proindicates the outer wall of thedoor; 10 the inner wall; and 11 the space between them.

In this case the casing 1 may be attached to the inner wall 10 of thedoor, and the outer wall 9 may be provided with a perforation to permitthe forward protrusion of the casing. In any event the upturning of thebulged portion of the tube avoids the protrusion of this portion intothe oven and permits the desired series of graduations to be included ina small vertical compass.

I cla1m':

jection of any portion of the thermometer 1. An oven thermometercomprising, a cas:

mg provided with a front compartment and a rear compartment, ascale-plate separating the two compartments and bearingcorripensatedgraduations to indicate oven temperature to the rear of the oven doorportiom an oven-door-portion constituting the rearwall of the rearcompartment, a thermometertube portion secured to the front of the scaleplate, and a bulbed portion forming aprolongation of thethermometer-tube disposed in the rear compartment of the casing at therear of the scale-plate, tially as set forth.

casing provided with a, front compartment and a rear compartment, ascale-plate separating the two compartments and bearing compensatedgraduations to indicate oven temperature to the rear of the oven doorportion, an oven-door-portion constituting combined substam- I 2. Anoven thermometer comprising, a

scaIq-plate, co mbin0 l Substantially as set forth.

3. An" oven thormomotvrrow )ris'inm- -21 Casing having :1 fonvurdlyopelrrotnngular re'cess, a 5calo-plat0 wrrm-d zrt zrdlshmco from thefront ol sun] roovss'ancl svparatmg the f-omva-rdl v open MW fronru roarrecess in the '(rz ljngaml hearing comppnsaifed grad lmtlons on' ltSfrom, means for socurmg tho camng 'agamst tho from ofmrovon-(loorportion, a t'hermonnotcrQtubc SOClll'MlfiilillSt tho-frontofthu scale-plate, :md a vbulbcd thermometer tubcrpo'rt-ion' disposod inthe' roar recess of 'thocus mg, combined subshrn- 1 tinlly as forth,

4 An ormr thermometer comp'rmng, :1

oasing'hzrving gl lroar oolnparhx'lelit and :i fol'-" war-(11y openfront compartmmlt,- mmu'ms for portion, 41 sculwplatu sopnrating thovtwo compm'tnwn'ts of the casing. and bouring 'compm'lsated gruduzrtionson its front, a thurmomotor-t-ubo soonrml in front of tho50:110- phlte, and- :1 hulhqd Hwrmonwirr tube portion dispocd inrtheroar rl'mmhv'r of tho casing, rombi'nod substantially as srfort'h.

' HORACE 13.: KERLIN. \Yitnesss:

'M .f S. "BILnEx; C AR ES GRESSLE;

